低纬度高原宇宙线快中子土壤水分监测方法适宜性研究

王中金; 吴苏; 吴东丽; 张振强; 赵杰; 李鹏; 陈海波

doi:10.12357/cjea.20210895

低纬度高原宇宙线快中子土壤水分监测方法适宜性研究

doi: 10.12357/cjea.20210895

王中金^{1, 2,},
吴苏²,
吴东丽³,
张振强²,
赵杰²,
李鹏²,
陈海波^1, ,

1.
中国气象局·河南省农业气象保障与应用技术重点开放实验室　郑州　450003
2.
中国电子科技集团公司第二十七研究所　郑州　450047
3.
中国气象局气象探测中心　北京　100081

基金项目: 中国气象局·河南省农业气象保障与应用技术重点开放实验室开放研究基金(AMF202103)和郑州市重大科技创新专项项目(2020CXZX0043)资助

详细信息

作者简介:
王中金, 主要研究方向为气象探测传感器及系统应用。E-mail: wangzhongjin2001@foxmail.com

通讯作者:
陈海波, 主要研究方向为农业气象自动化观测。E-mail: chenhaibo1116@163.com

中图分类号: S152.7
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- 被引次数: 0
出版历程
- 收稿日期: 2021-12-17
- 录用日期: 2022-03-14
- 网络出版日期: 2022-03-21
- 刊出日期: 2022-08-01

Suitability of the cosmic-ray fast neutron soil moisture monitoring method in a low-latitude plateau

WANG Zhongjin^{1, 2
,},
WU Su²,
WU Dongli³,
ZHANG Zhenqiang²,
ZHAO Jie²,
LI Peng²,
CHEN Haibo^{1
, ,}

1.
China Meteorological Administration·Henan Key Laboratory of Agrometeorological Support and Applied Technique, Zhengzhou 450003, China
2.
The 27th Research Institute of China Electronics Technology Group Corporation, Zhengzhou 450047, China
3.
China Meteorological Administration Meteorological Observation Centre, Beijing 100081, China

Funds: This study was supported by the Open Research Foundation of China Meteorological Administration·Henan Key Laboratory of Agrometeorological Support and Applied Technique (AMF202103) and the Major Scientific and Technological Innovation Projects in Zhengzhou City (2020CXZX0043).

More Information

Corresponding author: E-mail: chenhaibo1116@163.com

摘要

摘要: 宇宙线快中子土壤水分监测方法具有监测范围大、不受土壤盐碱程度影响、实时无损原位测量的特点, 对旱涝预警、节水灌溉、生态环境保护及土壤生产力提升等具有重要意义。为明确宇宙线快中子土壤水分监测方法在低纬度高原的适宜性, 本研究在中国南部开展了大范围烘干称重法测量, 验证宇宙线快中子法准确性, 以频域反射法做连续监测对比, 分析土壤水分相关性, 并结合雨量站观测数据, 研究其对土壤水分连续变化的响应能力。试验结果表明, 宇宙线快中子法与多点烘干称重法的线性拟合优度、均方根误差及绝对误差分别为0.898、0.013 cm³∙cm^–3和0.027 cm³∙cm^–3, 说明宇宙线快中子法在低纬度高原能够准确测量区域土壤含水量。在较长时间序列上, 宇宙线快中子法与频域反射法10 cm的土壤水分变化趋势完全一致, 线性拟合优度为0.839; 在对降水响应的灵敏性上, 降水量2 mm以上的降水过程, 两种方法均有明显响应, 降水量2 mm以下的降水过程, 宇宙线快中子法要略优于频域反射法。在本试验中, 宇宙线快中子土壤水分监测方法在低纬度高原区是适宜的, 对土壤水分空间变异性不敏感, 对百米级范围的平均土壤含水量的测量准确可信, 测量性能满足当前土壤含水量观测要求, 且能够提供实时土壤水分信息, 有效提高中尺度土壤水分监测效率与精度, 为相关土壤水分监测研究与应用提供参考, 对低纬度高原土地资源开发利用、环境保护、粮食自给等具有重要意义。
- 宇宙线 /
- 快中子 /
- 土壤水分 /
- 低纬度高原 /
- 烘干称重法 /
- 频域反射法
Abstract: The cosmic-ray fast neutron soil moisture monitoring method has a large monitoring range, is unaffected by soil salinity, allows real-time and non-destructive in situ measurement, and is of significance for drought and flood warning, water-saving irrigation, ecological environment protection, and soil productivity improvement. To clarify the suitability of the cosmic-ray fast neutron soil moisture monitoring method in the low-latitude plateau, this study conducted a large-scale soil moisture investigation using oven-drying method in the southern Chinese city of Dali (25°42ʹ14″N, 100°10ʹ34″E) from May to September 2020 to verify the accuracy of the cosmic-ray fast neutron method. At the experimental site, a cosmic-ray fast neutron soil moisture station, frequency domain reflectometer (FDR) soil moisture station, and rainfall monitoring station were installed. FDR was used for continuous monitoring and comparison, and the correlation of soil moisture in the 0–50 cm soil layer was analyzed. Combined with the observation data of rainfall stations, the response ability of cosmic-ray fast neutrons and FDR to continuous changes in soil moisture was studied. The experimental results showed that the determination coefficient of the linear equation (R²), root-mean-square error (RMSE), and absolute error between the soil moisture content measured by the cosmic-ray fast neutron method and by the multi-point mean value of the oven-drying method were 0.898, 0.013 cm³∙cm^–3, and 0.027 cm³∙cm^–3, respectively. This shows that the cosmic-ray fast neutron method can accurately measure the regional soil water content in low-latitude plateaus. In the long time series, the cosmic-ray fast neutron method and FDR have a consistent trend of soil moisture changes in the 10 cm soil layer, and the determination coefficient of the linear equation (R²) was 0.839. This shows that the cosmic-ray fast neutron method can respond to soil moisture changes over time, similar to FDR. In terms of sensitivity to precipitation, if the precipitation amount was more than 2 mm for the precipitation process, and both methods had obvious responses. For the precipitation process with precipitation below 2 mm, the cosmic-ray fast neutron method was slightly better than FDR. However, more obvious sensitivity was not observed in this experiment, especially for the precipitation process with precipitation below 1 mm, which may be related to the loose texture of the surface soil in the experimental area and the rapid shift of sunny and rainy weather. In this experiment, the cosmic-ray fast neutron soil moisture monitoring method was suitable in the low-latitude plateau region, was not sensitive to the spatial variability of soil moisture, and was accurate and reliable for measuring the average soil moisture content in the range of 100 m. It meets the current soil moisture observation requirements, can provide real-time soil moisture information, effectively improving the efficiency and accuracy of mesoscale soil moisture monitoring, and provides a reference for related soil moisture monitoring research and applications.
- Cosmic-ray /
- Fast neutron /
- Soil moisture /
- Low-latitude plateau /
- Oven-drying method /
- Frequency Domain Reflectometry

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图 1 人工取样位置及取样深度示意图

Figure 1. Location and depth of artifical sampling points

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图 2 宇宙线快中子法与烘干称重法的土壤含水量测量结果对比

Figure 2. Comparison between soil moisture measured by cosmic-ray fast neutron method and drying weighing method

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图 3 宇宙线快中子法与烘干称重法测定的土壤含水量线性拟合

Figure 3. Linear fitting between soil moisture measure by cosmic-ray fast neutron method and drying weighing method

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图 4 宇宙线快中子法与FDR法土壤含水量测量结果对比

Figure 4. Comparison between soil moisture measured by cosmic-ray fast neutron method and Frequency Domain Reflectometry (FDR) method

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图 5 宇宙线快中子法及FDR法土壤含水量测量数据趋势分析

Figure 5. Trend analysis of soil moisture measured by cosmic-ray fast neutron method and Frequency Domain Reflectometry (FDR) method

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表 1 宇宙线快中子法与FDR法测定的土壤含水量的相关性分析

Table 1. Correlation analysis of soil moisture between cosmic-ray fast neutron method and Frequency Domain Reflectometry method

深度 Depth (cm) 0~10 0~20 0~30 0~40 0~50

R² 0.839 0.826 0.805 0.809 0.792
RMSE (cm³·cm^–3) 0.057 0.045 0.044 0.037 0.036

下载: 导出CSV

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